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<br />2.4 Flood Protection Measures <br /> <br />No specific flood protection works have been undertaken in the City <br />of Durango. However, some flood protection measures are provided in <br />the City Resolutions. <br /> <br />City Resolution No. 292 requires that any proposed construction, or <br />substantial improvement in a location having a flood hazard, be <br />designed (or modified) and anchored to prevent flotation, collapse, <br />or lateral movement of the structure; all construction materials and <br />utility equipment that are used be resistant to flood damage; and, <br />all construction methods and practices that are used will minimize <br />flood damage. Proposed subdivisions and new developments shall be <br />reviewed to assure that all public utilities and facilities are <br />located, elevated, and constructed to minimize Or eliminate flood <br />damage, and adequate drainage must be provided to reduce exposure of <br />flood hazards. <br /> <br />The City of Durango has also adopted the National Flood Insurance <br />Act of 1968, which provides relief in the form of federally <br />subsidized flood insurance. City Resolution No. 293 provides land <br />use and control measures with effective enforcement provisions which <br />are consistent with the criteria set forth in Section 1910 of the <br />NFIP regulations. <br /> <br />3.0 ENGINEERING METHODS <br /> <br />For the flooding sources studied in detail in the community. standard <br />hydrologic and hydraulic study methods are used to determine the flood <br />hazard data required for this study. Flood events of a magnitude which <br />are expected to be equaled or exceeded once on the average during any <br />10-, 50-, 100-, or 500-year period (recurrence interval) have been <br />selected as having special significance for floodplain management and for <br />flood insurance rates. These events. commonly termed the 10-, 50-, 100-, <br />and 500-year floods, have a 10-, 2-, 1-, and 0.2-percent chance, <br />respectively, of being equaled or exceeded during any year. Although the <br />recurrence interval represents the long term avera~e period between <br />floods of a specific magnitude, rare floods could occur at short <br />intervals or even within the same year. The risk of experiencing a rare <br />flood increases when periods greater than 1 year are considered. For <br />example, the risk of having a flood which equals or exceeds the 100-year <br />flood (I-percent chance of annual exceedence) in any SO-year period is <br />approximately 40 percent (4 in 10), and for any 90-year period, the risk <br />increases to approximately 60 percent (6 in 10). The analyses reported <br />herein reflect flooding potentials based on conditions existing in the <br />community at the time of completion of this study. Maps and flood <br />elevations will be amended periodically to reflect future changes. <br /> <br />6 <br />